High-response servo valve

Abstract

A high-response servo valve, relating to the technical field of rotary direct-drive servo valves. The high-response servo valve comprises a valve body, a valve spool disposed inside the valve body, and a valve sleeve surrounding the valve spool. The valve body is internally provided with a liquid flow passage for oil circulation. The liquid flow passage is arranged in layered form, and an end of the liquid flow passage close to the valve sleeve is provided with symmetrically arranged oil supply ports and / or oil return ports. The valve sleeve is provided with at least two groups of through-slots communicating an inner wall with an outer wall. The through-slots conduct oil in the oil supply ports into the interior of the valve sleeve, and conduct oil within the valve sleeve to the oil return ports. An inner-wall spacing of each through-slot gradually decreases from a side close to the valve body to a side close to the valve spool. By arranging the liquid flow passage in layered form, forces ultimately acting on the valve spool are uniformly dispersed. Moreover, the oil supply ports of the liquid flow passage at the same level are symmetrically arranged on the valve sleeve, so that an axial torque ultimately acting on the valve spool is further counteracted, thereby enhancing the response speed of the servo valve.

Description

A high-response servo valve

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 202411933601.8, filed on December 26, 2024, entitled "A High-Response Servo Valve", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of rotary direct-drive servo valve technology, and particularly to a high-response servo valve. Background Technology

[0004] With the continuous advancement of modern industrial technology, servo valves, as crucial control components in hydraulic systems, have been widely used in many high-precision control fields. Traditional servo valves typically combine motor drive with mechanical transmission systems (such as gears, levers, etc.), transmitting the motor's power to the valve core via mechanical transmission to achieve precise control of fluid flow and pressure. However, traditional servo valves suffer from a series of problems, including complex structure, response delay, large size, and low energy efficiency, limiting their application in fields with high requirements for size, weight, response speed, and energy efficiency.

[0005] As a new type of servo valve, the rotary direct-drive servo valve directly drives the valve core with a motor, eliminating the traditional mechanical transmission part and achieving high control precision and response speed. However, in order to obtain high control precision and response speed, a series of problems have arisen, such as lower flow rate, greater weight, and larger size. Therefore, it is imperative to improve the rotary direct-drive servo valve to increase its flow rate, reduce its weight, and even reduce its size while ensuring good control precision and response speed, so as to be more widely applicable to various high-performance application scenarios. Summary of the Invention

[0006] The main objective of this disclosure is to provide a high-response servo valve that aims to improve the flow rate of a rotary direct-drive servo valve while further enhancing its response speed.

[0007] In one alternative embodiment, the high-response servo valve includes a valve body, a valve core disposed within the valve body, and a valve sleeve surrounding the valve core and disposed within the valve body.

[0008] The valve body has a liquid flow channel for oil circulation. The liquid flow channel is arranged in layers, and the liquid flow channel has a symmetrically arranged oil supply port and / or oil return port at one end near the valve sleeve. The valve sleeve has at least two sets of through grooves that connect the inner and outer walls. The through grooves guide the oil in the oil supply port to the inside of the valve sleeve and guide the oil in the valve sleeve to the oil return port. The distance between the inner walls of the through grooves gradually decreases from the side near the valve body to the side near the valve core.

[0009] In an optional embodiment, the liquid flow channel includes an oil supply flow channel, and the oil supply flow channel is provided with multiple sets of oil supply ports around the valve core, each set having two oil supply ports, and the two oil supply ports of each set are symmetrically distributed about the axial center of the valve core.

[0010] The through groove connecting to the oil supply port corresponds to the position of the oil supply port.

[0011] In an optional embodiment, the oil supply channel includes a main oil supply channel and a plurality of branch oil supply channels connected to the main oil supply channel, and the branch oil supply channels are provided one-to-one with the oil supply ports. The main oil supply channel is configured to connect to the oil supply equipment.

[0012] Multiple sets of oil supply ports are arranged in multiple layers along the height direction of the valve body, with two oil supply ports in any group arranged in the same layer, and multiple sets of oil supply ports located in the same layer arranged symmetrically about the axis of the valve core.

[0013] In an optional embodiment, the liquid flow channel further includes a return oil flow channel, which is provided with multiple sets of return oil ports around the valve core, each set having two return oil ports, and the two return oil ports of each set are symmetrically distributed about the axial center of the valve core.

[0014] The through groove connecting to the oil return port corresponds to the position of the oil return port.

[0015] In an optional embodiment, the return oil channel includes a main return oil channel and a plurality of branch return oil channels communicating with the main return oil channel, and the branch return oil channels are provided one-to-one with the return oil ports, and the main return oil channel is configured to connect to the return oil device.

[0016] Multiple sets of oil return ports are arranged in multiple layers along the height direction of the valve body, with two oil supply ports in each set arranged in the same layer, and multiple sets of oil return ports located in the same layer arranged symmetrically about the axis of the valve core.

[0017] In an optional embodiment, the liquid flow channel includes an oil supply flow channel and an oil return flow channel;

[0018] The oil supply channel is provided with multiple sets of oil supply ports around the valve core, each set having two oil supply ports, and the two oil supply ports of each set are symmetrically distributed about the axial center of the valve core.

[0019] The return oil channel is provided with multiple sets of return oil ports around the valve core, each set having two return oil ports, and the two return oil ports of each set are symmetrically distributed about the axial center of the valve core.

[0020] The oil supply port and the oil return port, located on the same layer, are symmetrically arranged about two diameters perpendicular to the valve core.

[0021] In an optional embodiment, the through groove is formed radially along the valve sleeve;

[0022] The side walls of the through groove in the circumferential direction of the valve sleeve are the first side wall and the second side wall, respectively.

[0023] The distance between the first sidewall and the second sidewall gradually decreases in the radial direction of the valve sleeve from the outside to the inside.

[0024] Each group has two through slots, and the two through slots in each group are symmetrically distributed about the axial center of the valve core.

[0025] In an optional embodiment, the through grooves are evenly arranged around the valve sleeve, and the plane of each set of through grooves is perpendicular to the axial extension line of the valve sleeve, with the spacing between two adjacent sets of through grooves being 0.5mm-50mm.

[0026] And / or,

[0027] The through grooves in the same group have the same size, and any two adjacent groups of through grooves are offset relative to each other in the circumferential direction of the valve sleeve, with the offset angle being less than or equal to 90°.

[0028] In an optional implementation, the number of adjacent sets of through slots is the same, and their size and shape are identical; or, at least one of the number, size, and shape of adjacent sets of through slots is different.

[0029] In an optional embodiment, the included angle formed by the through groove relative to the inner wall extension surfaces on both sides is less than 60°;

[0030] And / or,

[0031] The gap between the valve core and the valve sleeve is 0um-25um.

[0032] In an optional embodiment, the valve sleeve is slidably fitted with the valve core, and the inner and outer surfaces of the valve sleeve are provided with pressure equalization grooves between two adjacent sets of through grooves, and / or the inner and outer surfaces of the valve sleeve are provided with pressure equalization grooves between any two adjacent through grooves.

[0033] In an optional embodiment, the oil supply port and / or oil return port of the liquid flow channel in the same layer correspond to the same group of through slots opened on the valve sleeve, and the number of through slots in the same group is greater than or equal to the sum of the number of oil supply ports and the number of oil return ports of the liquid flow channel in the corresponding layer.

[0034] In an optional embodiment, the liquid flow channel further includes a control flow channel, which has multiple control ports for controlling the flow direction of the oil. The oil supply ports of the same level liquid flow channel are arranged radially symmetrically around the valve sleeve, the oil return ports of the same level liquid flow channel are arranged radially symmetrically around the valve sleeve, and the control ports of the same level liquid flow channel are arranged radially symmetrically around the valve sleeve.

[0035] In an optional implementation, an oil supply port, a control port, and an oil return port are provided on the same layer of liquid flow channel, wherein the three are arranged at intervals, and the oil supply ports, oil return ports, and control ports of all levels are independent of each other, but the same type of ports are interconnected; or,

[0036] Only an oil supply port and a control port are provided on the same layer of liquid flow channel, and the oil supply port and the control port are arranged at intervals;

[0037] or,

[0038] Only return ports and control ports are provided on the same layer of liquid flow channel, and the return ports and control ports are set at intervals;

[0039] or,

[0040] Only an oil supply port and a control port are provided on the same layer of liquid flow channel, and the oil supply port and the control port are spaced apart; only an oil return port and a control port are provided on the same layer of liquid flow channel, and the oil return port and the control port are spaced apart; wherein: the two layers of liquid flow channels with only an oil supply port and a control port and the two layers with only an oil return port and a control port are connected through the control port.

[0041] In an optional embodiment, the control flow channel includes a first control flow channel and a second control flow channel that are independent of each other; the first control flow channel is provided with at least one set of first control ports, each set of first control ports being symmetrically distributed about the axial center of the valve core, and the valve sleeve is provided with the through groove corresponding to the first control port; the second control flow channel is provided with at least one set of second control ports, each set of second control ports being symmetrically distributed about the axial center of the valve core, and the valve sleeve is provided with the through groove corresponding to the second control port;

[0042] The oil supply port, the first control port, and the second control port are arranged on the same layer and spaced apart sequentially. Rotation of the valve core allows the oil supply port to selectively connect with either the first control port or the second control port. Alternatively, the oil return port, the first control port, and the second control port are arranged on the same layer and spaced apart sequentially. Rotation of the valve core allows the oil return port to selectively connect with either the first control port or the second control port. Alternatively, the oil supply port, the oil return port, and the first control port are arranged on the same layer and spaced apart sequentially. Rotation of the valve core allows the first control port to connect with either the oil supply port or the oil return port. Alternatively, the oil supply port, the oil return port, and the second control port are arranged on the same layer and spaced apart sequentially. Rotation of the valve core allows the second control port to connect with either the oil supply port or the oil return port.

[0043] In an optional embodiment, at least one set of guide grooves are provided around the valve core. The guide grooves in the same set are of the same size and are radially evenly distributed on the valve core. There is an angular offset between adjacent sets of guide grooves, and the value of the offset angle is less than or equal to 90°.

[0044] When the valve core is rotated to the first preset angle, the guide groove can connect the through grooves corresponding to the oil supply port and the oil return port.

[0045] When the valve core rotates to the second preset angle, the interval between the guide grooves can block the oil supply port and the oil return port corresponding to the through groove.

[0046] In an optional implementation, the number of adjacent groups of guide channels is the same, and the size and shape of adjacent groups of guide channels are the same; or, the number, size and shape of adjacent groups of guide channels are different in at least one of the following:

[0047] or,

[0048] The opening of the guide groove is a plane, and the plane is concave relative to the outer surface of the valve core at that location.

[0049] In an optional embodiment, the valve sleeve and the valve body are respectively provided with a positioning component for cooperation. The positioning component is used to restrict the valve sleeve from rotating relative to the valve body, so that a set of through grooves corresponds to the position of the oil supply port and a set of through grooves corresponds to the position of the oil return port.

[0050] And / or,

[0051] The valve body is provided with a limiting structure that restricts the rotation angle of the valve core.

[0052] In an optional embodiment, the high-response servo valve further includes a servo motor for driving the valve core, the servo motor including an internal rotor, the rotor being a regular polygonal structure or a circular structure;

[0053] Wherein, when the rotor is a regular polygonal structure, the number of sides of the regular polygon satisfies 2N+2, where N is a positive integer.

[0054] In an alternative embodiment, a high-response servo valve is characterized in that: the high-response servo valve includes a valve body, a valve core disposed within the valve body, and a valve sleeve surrounding the valve core and disposed within the valve body;

[0055] The valve body has a liquid flow channel for oil circulation. The liquid flow channel is arranged in layers, and the liquid flow channel has a symmetrically arranged oil supply port and / or oil return port at one end near the valve sleeve. The valve sleeve has at least two sets of through grooves that connect the inner and outer walls. The through grooves guide the oil in the oil supply port to the inside of the valve sleeve and guide the oil in the valve sleeve to the oil return port.

[0056] The technical solution disclosed herein uses a layered liquid flow channel, and then the through grooves on the valve sleeve act on the valve core, so that the force of the oil acting on the valve core is evenly distributed, rather than acting uniformly in a very small area of ​​the valve core. Furthermore, the oil supply ports of the same layer of liquid flow channel are symmetrically arranged on the valve sleeve, so that the forces acting on the valve sleeve and even the same area of ​​the valve core in different directions cancel each other out, reducing the axial torque on the valve core. Specifically, the design of the spacing between the inner walls of the through grooves on the valve sleeve gradually decreasing from the side closer to the valve body to the side closer to the valve core reduces or even completely eliminates the oil vortex on the outer wall of the valve sleeve when the oil flows through the through grooves, thereby reducing the energy loss of the valve body. At the same time, the oil pressure flowing through the valve core is consistent, making the force on the valve core more balanced, further canceling the axial torque on the valve core and promoting the response speed of the servo valve. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0058] Figure 1 is a schematic diagram of the servo valve structure of an embodiment of the high-response servo valve provided in this disclosure;

[0059] Figure 2 is a schematic diagram of the liquid flow channel in one embodiment of the high-response servo valve provided in this disclosure;

[0060] Figure 3 is a cross-sectional view of the liquid flow channel in one embodiment of the high-response servo valve provided in this disclosure;

[0061] Figure 4 is a cross-sectional view of the valve core and valve sleeve in one embodiment of the high-response servo valve provided in this disclosure;

[0062] Figure 5 is a schematic diagram of the valve core and rotor in another embodiment of the high-response servo valve provided in this disclosure.

[0063] Figure 6 is a cross-sectional view of the valve body and valve sleeve in another embodiment of the high-response servo valve provided in this disclosure;

[0064] Figure 7 is a structural schematic diagram of the valve sleeve and positioning assembly in another embodiment of the high-response servo valve provided in this disclosure;

[0065] Figure 8 is a schematic diagram of the valve body in another embodiment of the high-response servo valve provided in this disclosure;

[0066] Figure 9 is a schematic diagram of the two-layer oil passage connecting the valve core at different angles in the high-response servo valve provided in this disclosure.

[0067] Figure 10 is a schematic diagram of the first layer of oil passage in the high-response servo valve provided in this disclosure;

[0068] Figure 11 is a structural deformation diagram of the first layer of oil passage in the high-response servo valve provided in this disclosure;

[0069] Figure 12 is a schematic diagram of the second-layer oil passage in the high-response servo valve provided in this disclosure;

[0070] Figure 13 is a structural deformation diagram of the first layer of oil passage in another high-response servo valve provided in this disclosure;

[0071] Figure 14 is a schematic diagram of the second oil passage in the high-response servo valve shown in Figure 13;

[0072] Figure 15 is a schematic diagram of a partial explosion after the liquid flow channel in the high-response servo valve shown in Figure 13 is materialized.

[0073] Icons: 1. High-response servo valve; 11. Valve body; 12. Valve core; 13. Valve sleeve; 14. Positioning assembly; 15. Servo motor; 111. Liquid flow channel; 1111. Oil supply port; 1112. Oil return port; 1113. Control port; 1114. First control port; 1115. Second control port; 1116. Oil supply channel; 117. Oil return channel; 118. Control oil passage; 1119. Control oil passage; 1120. First control oil passage; 1121. Second control oil passage; 112. Limiting structure; 121. Guide groove; 131. Through groove; 1311. First side wall; 1312. Second side wall; 132. Pressure equalizing groove; 141. Positioning groove; 142. Positioning ball; 151. Rotor; 1511. Connecting groove; 1512. Machining groove.

[0074] The realization of the purpose, functional features and advantages of this disclosure will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0075] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0076] It should be noted that if directional indicators (such as up, down, left, right, front, back, etc.) are involved in the embodiments of this disclosure, such directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0077] Furthermore, if the embodiments of this disclosure involve descriptions such as "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Furthermore, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel options; for example, "A and / or B" includes option A, option B, or options where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this disclosure.

[0078] With the continuous advancement of modern industrial technology, servo valves, as crucial control components in hydraulic systems, have been widely used in many high-precision control fields. Traditional servo valves typically combine motor drive with mechanical transmission systems (such as gears, levers, etc.), transmitting the motor's power to the valve core via mechanical transmission to achieve precise control of fluid flow and pressure. However, traditional servo valves suffer from a series of problems, including complex structure, response delay, large size, and low energy efficiency, limiting their application in fields with high requirements for size, weight, response speed, and energy efficiency.

[0079] As a new type of servo valve, the rotary direct-drive servo valve directly drives the valve core with a motor, eliminating the traditional mechanical transmission part and achieving high control precision and response speed. However, in order to obtain high control precision and response speed, a series of problems have arisen, such as lower flow rate, greater weight, and larger size. Therefore, it is imperative to improve the rotary direct-drive servo valve to increase its flow rate, reduce its weight, and even reduce its size while ensuring good control precision and response speed, so as to be more widely applicable to various high-performance application scenarios.

[0080] Referring to Figure 1, this disclosure proposes a high-response servo valve 1. This high-response servo valve 1 can be applied to flight control systems for aircraft, industrial automation, robotics, and automotive manufacturing to rapidly and accurately control equipment movements.

[0081] Referring to Figures 1-4, in one embodiment of this disclosure, the high-response servo valve 1 includes a valve body 11, a valve core 12 disposed within the valve body 11, and a valve sleeve 13 surrounding the valve core 12 and disposed within the valve body 11.

[0082] The valve body 11 has a liquid flow channel 111 for oil circulation. The liquid flow channel 111 is arranged in layers, and the liquid flow channel 111 has a symmetrically arranged oil supply port 1111 and / or oil return port 1112 at one end near the valve sleeve 13. The valve sleeve 13 has at least two sets of through grooves 131 that connect the inner and outer walls. The through grooves 131 guide the oil in the oil supply port 1111 to the inside of the valve sleeve 13 and guide the oil in the valve sleeve 13 to the oil return port 1112. The distance between the inner walls of the through grooves 131 gradually decreases from the side near the valve body 11 to the side near the valve core 12.

[0083] Understandably, the spacing between the inner walls of the through groove 131 gradually decreases from the side closer to the valve body 11 to the side closer to the valve core 12. That is, the through groove 131 has a certain taper. The larger end of the groove receives the oil sprayed from the liquid flow channel 111 and balances the oil pressure in the through groove 131 before being sprayed onto the surface of the valve core 12 from the smaller end of the groove. At this time, the eddy current generated by the oil acting on the valve sleeve 13 and the valve core 12 is smaller, and the axial torque transmitted to the valve sleeve 13 and even the valve core 12 is smaller.

[0084] It should be noted that the layered arrangement of the liquid flow channel 111 means that the oil supply port 1111 of the liquid flow channel 111 is arranged in multiple layers along the axial extension direction on the outer surface of the valve sleeve 13. The oil supply port 1111 of each layer of the liquid flow channel 111 is arranged radially symmetrically on the valve sleeve 13, so that when the hydraulic pressure is the same, the line connecting the points where the oil injected from the liquid flow channel 111 impacts the valve sleeve 13 forms a circle. Specifically, the plane of this circle is perpendicular to the axial extension direction of the valve sleeve 13.

[0085] In this embodiment, the liquid flow channel 111 includes an oil supply channel 1116, which surrounds the valve core 12 and has multiple sets of oil supply ports 1111. Each set has two oil supply ports 1111, and the two oil supply ports 1111 in each set are symmetrically distributed about the axial center of the valve core 12. The through groove 131 connecting the oil supply ports 1111 corresponds to the position of the oil supply ports 1111.

[0086] Understandably, by designing the position of the oil supply port 1111 in each layer of liquid flow channel 111, the hydraulic oil flowing out of the two oil supply ports 1111 in each group flows in opposite directions, so that the overall force acting on the valve sleeve 13 after the oil flows out can cancel each other out. When the oil flows to the surface of the valve core 12 through the through groove 131, the axial torque on the valve core 12 can also be canceled out by the design of the through groove 131, and the total axial torque is zero.

[0087] Furthermore, the oil supply channel 1116 includes a main oil supply channel 1116 and multiple branch oil supply channels 1116 connected to the main oil supply channel 1116. Each branch oil supply channel 1116 is correspondingly provided with an oil supply port 1111. The main oil supply channel 1116 is configured to connect to an oil supply device. The oil supply device can be a hydraulic oil pump. Multiple sets of oil supply ports 1111 are arranged in multiple layers along the height direction of the valve body 11. Any two oil supply ports 1111 in each set are arranged on the same layer, and the multiple sets of oil supply ports 1111 located on the same layer are symmetrically arranged about the axis of the valve core 12.

[0088] Specifically, in the specific embodiments of this disclosure, the oil supply port 1111 of the liquid flow channel 111 is arranged in an axisymmetric manner. By axially symmetrical arrangement, the forces of two opposite oil supply ports 1111 can be completely canceled out when the oil pressure is the same. That is, the number of oil supply ports 1111 in the same level is 2N, where N≥1.

[0089] More specifically, the arrangement of the liquid flow channels 111 outlets between different levels along the axial direction on the valve sleeve 13 can be equidistant or unequal; they can be located near the middle of the valve sleeve 13 or at both ends of the valve sleeve 13 along the axial direction. There are no restrictions here, and the actual production shall prevail.

[0090] Furthermore, the liquid flow channel 111 also includes a return oil flow channel 1117, which is independent of the supply oil flow channel 1116. The return oil flow channel 1117 has multiple sets of return ports 1112 surrounding the valve core 12, each set having two return ports 1112, symmetrically distributed about the axial center of the valve core 12. The through groove 131 connecting the return ports 1112 corresponds to the position of the return ports 1112.

[0091] Specifically, the return oil flow channel 1117 includes a main return oil flow channel 1117 and multiple branch return oil flow channels 1117 connected to the main return oil flow channel 1117. Each branch return oil flow channel 1117 is correspondingly provided with a return oil port 1112. The main return oil flow channel 1117 is configured to connect to the return oil device. Multiple sets of return oil ports 1112 are arranged in multiple layers along the height direction of the valve body 11. The two oil supply ports 1111 of any group are arranged on the same layer, and the multiple sets of return oil ports 1112 located on the same layer are symmetrically arranged about the axis of the valve core 12.

[0092] In this embodiment, the two return ports 1112 of each group are symmetrically distributed about the axis of the valve core 12, so that the overall force acting on the valve sleeve 13 after the oil flows out can cancel each other out, which can improve the stability of the valve sleeve 13 and the valve core 12.

[0093] In one embodiment of the application, the oil supply port 1111 and the oil return port 1112 located on the same layer are symmetrically arranged about two diameters perpendicular to the valve core 12.

[0094] By arranging the oil supply port 1111 and oil return port 1112 on the same layer in a centrally symmetrical superimposed centrally symmetrical manner, the stability of operation can be improved.

[0095] In the embodiments of this disclosure, through grooves 131 are uniformly arranged around the valve sleeve 13, and the plane of each group of through grooves 131 is perpendicular to the axial extension line of the valve sleeve 13, and the distance between two adjacent groups of through grooves 131 is 0.5mm-50mm.

[0096] Understandably, the same set of through grooves 131 corresponds to the same set of oil supply ports 1111 at the same level. In order to ensure that the axial torque of the oil sprayed from the oil supply port 1111 on the valve sleeve 13 can be canceled, the line connecting the points where the oil sprayed from the liquid flow channel 111 impacts the valve sleeve 13 is a circle. The plane of this circle is perpendicular to the axial extension direction of the valve sleeve 13. The landing point of the oil on the valve sleeve 13 is also in the through groove 131 of the valve sleeve 13. Therefore, the plane of each set of through grooves 131 should also be perpendicular to the axial extension line of the valve sleeve 13.

[0097] Optionally, the spacing between two adjacent sets of through slots 131 can be 0.5mm, 1.8mm, 2.6mm, 5.0mm, 7.8mm, 10mm, 14.2mm, 26.5mm, 33.1mm, 45.7mm, or 50mm.

[0098] Preferably, the spacing between two adjacent sets of through slots 131 is 0.5mm-10mm.

[0099] Furthermore, the through groove 131 is formed radially along the valve sleeve 13. The sidewalls of the through groove 131 in the circumferential direction of the valve sleeve 13 are a first sidewall 1311 and a second sidewall 1312. The distance between the first sidewall 1311 and the second sidewall 1312 gradually decreases radially from the outer side of the valve sleeve 13 towards the inner side. Each group has two through grooves 131, and the two through grooves 131 in each group are symmetrically distributed about the axial center of the valve core 12.

[0100] This design of the cross-section of the through groove 131 can buffer the flowing oil, thereby reducing the impact on the valve core 12 and improving accuracy. In the embodiments of this disclosure, the dimensions of the same group of through grooves 131 are the same, and there is an angular offset between adjacent groups of through grooves 131, the angular offset range being less than or equal to 90°.

[0101] Optionally, in one embodiment of this disclosure, the number of adjacent sets of through slots 131 is the same, and their size and shape are identical.

[0102] Alternatively, in another embodiment of this disclosure, at least one of the number, size, and shape of two adjacent sets of through slots 131 is different.

[0103] Specifically, the outline shape of the through groove 131 can be triangular, circular, elliptical, or polygonal.

[0104] It should be noted that, based on the different shapes of the through grooves 131, the angle of the through grooves 131 can be adjusted accordingly, so that the arrangement of two adjacent sets of through grooves 131 can be made more compact without changing the size of the through grooves 131, thereby reducing the overall volume of the valve sleeve 13.

[0105] More specifically, the polygon includes regular quadrilaterals and skew quadrilaterals, specifically rectangles and squares.

[0106] Optionally, the angular offset between two adjacent sets of through slots 131 can be 5°, 10°, 23.5°, 30°, 45°, 67.5°, 81°, or 90°.

[0107] Specifically, the angular offset between two adjacent sets of through slots 131 is less than or equal to 45°.

[0108] In the embodiments of this disclosure, the number of through grooves 131 is greater than the number of oil inlets 1111 of the liquid flow channels 111 of the corresponding level of the group of through grooves 131, and the oil inlets 1111 of the liquid flow channels 111 of the same level correspond to the group of through grooves 131 opened on the valve sleeve 13.

[0109] Referring to Figures 1, 4 and 5, in the embodiments of this disclosure, the included angle formed by the through groove 131 relative to the inner wall extension surfaces on both sides is less than or equal to 60°.

[0110] It should be noted that the included angle range mentioned here is also the taper range of the through groove 131. If the taper is too large, the shape and size of the outer wall of the through groove 131 will be difficult to control, and at the same time, the oil flow to the surface of the valve core 12 will be too small, affecting its practicality.

[0111] It can be seen that when the through groove 131 is circular, elliptical, triangular or non-regular polygonal, it is limited by the taper of the cone, the taper of the elliptical cone, the taper of the triangular pyramid and the range of the included angle formed by the extended surfaces of the opposite sides of the non-regular polygon, respectively.

[0112] Preferably, the included angle formed by the through groove 131 relative to the inner wall extension surfaces on both sides is less than or equal to 35°.

[0113] Referring to Figures 5-8, in the embodiments of this disclosure, the valve sleeve 13 and the valve body 11 are respectively provided with positioning components 14 for cooperation. The positioning components 14 are used to restrict the valve sleeve 13 from rotating relative to the valve body 11, so that one set of through grooves 131 corresponds to the oil supply port 1111 of the liquid flow channel 111, and another set of through grooves 131 corresponds to the oil return port 1112 of the liquid flow channel 111.

[0114] It should be noted that during the assembly process of the servo valve, assembly errors will affect the accuracy of the servo valve. The reduction in accuracy will lead to a reduction in the response speed of the servo valve. Therefore, in order to ensure a sufficiently excellent response speed, the accuracy requirements must be met.

[0115] Understandably, by setting up a positioning component 14 for use in conjunction with the valve, the valve sleeve 13 and valve body 11 are ensured to be installed in place during assembly through the mating relationship of the components, thus meeting the accuracy requirements.

[0116] Specifically, in the specific embodiments of this disclosure, positioning notches are provided on both sides of at least one end face of the valve sleeve 13 and the inner wall of the valve body 11 at the same location. The positioning notches of the valve sleeve 13 and the valve body 11 at the same location jointly define a positioning groove 141. A positioning ball 142 is provided in the positioning groove 141. When the valve sleeve 13 and the valve body 11 are fully engaged, the positioning ball 142 is adapted to the positioning groove 141 and abuts against the inner wall of the positioning groove 141. When the positions of the valve sleeve 13 and the valve body 11 are offset, the positioning ball 142 cannot be adapted to the positioning groove 141. At this time, the positioning ball 142 cannot fall into the positioning groove 141. The user can determine whether the valve sleeve 13 and the valve body 11 are installed in place by observing the state of the positioning ball 142.

[0117] In the embodiments of this disclosure, the valve sleeve 13 is slidably fitted with the valve core 12, and the inner wall and outer surface of the valve sleeve 13 are provided with pressure equalization grooves 132 between two adjacent sets of through grooves 131, and / or the inner wall and outer surface of the valve sleeve 13 are provided with pressure equalization grooves 132 between each set of through grooves 131.

[0118] It should be noted that the pressure equalization groove 132 on the outer surface of the valve sleeve 13 is used to reduce oil leakage between the valve sleeve 13 and the valve body 11.

[0119] The pressure equalization groove 132 on the inner wall of the valve sleeve 13 is used to reduce the friction between the valve sleeve 13 and the valve core 12 and reduce oil leakage between the valve sleeve 13 and the valve core 12. This design can effectively prevent the valve core 12 from jamming.

[0120] Specifically, there can be multiple equalizing grooves 132 between two adjacent groups of through grooves 131, and / or between two adjacent through grooves 131 within the same group.

[0121] More specifically, the shape of each equalizing groove 132 is not limited and can be a straight line, a broken line, a curve, a graphic or a symbol.

[0122] Specifically, there is a gap between the valve core 12 and the valve sleeve 13, which ranges from 0um to 25um.

[0123] Understandably, when the valve sleeve 13 and the valve core 12 are in complete contact, the larger the contact area, the greater the friction, which will hinder the movement of the valve core 12, resulting in longer working time and even wear on the contact surface. Therefore, by opening a through groove 131 on the valve sleeve 13, a guide groove 121 on the valve core 12, and even a pressure equalization groove 132 on the inner wall of the valve sleeve 13, the oil flow can be guided and leakage can be prevented. At the same time, by controlling the size of multiple grooves, the contact area can be further reduced, so that the friction between the valve core 12 and the valve sleeve 13 is reduced to a suitable operating range.

[0124] It should be noted that the gap between the valve core 12 and the valve sleeve 13 should not be too large. An increased gap will increase oil leakage, especially internal leakage. Furthermore, an excessively large gap between the valve core 12 and the valve sleeve 13 will reduce space utilization, thereby increasing the overall size of the servo valve.

[0125] Specifically, in the specific embodiments disclosed herein, the range of the gap is not explicitly limited, but is based on the actual required size.

[0126] Preferably, in a specific embodiment of this disclosure, the gap between the valve core 12 and the valve sleeve 13 is in the range of 1µm-8µm.

[0127] In the embodiments of this disclosure, a limiting structure 112 is provided on the valve body 11 to limit the rotation angle of the valve core 12.

[0128] It should be noted that the limiting structure 112 is set on the valve body 11, giving the valve core 12 a range of rotation space. However, when the valve core 12 rotates beyond this range, it will hinder the rotation of the valve core 12, so that the maximum rotation angle of the valve core 12 is fixed. If the maximum rotation angle is exceeded, it will be blocked and thus stop rotating.

[0129] In the embodiments of this disclosure, the high-response servo valve 1 further includes a servo motor 15 for driving the valve core 12 to move. The servo motor 15 includes a rotor 151 disposed inside. The rotor 151 is integrally connected to the valve core 12. The rotor 151 is a regular polygonal structure or a circular structure, wherein the number of sides of the regular polygon is 2N+2, and N≥1.

[0130] It should be noted that the valve core 12 and rotor 151 of a conventional rotary direct drive servo valve are detachably connected and require an additional mating structure to achieve the connection for further transmission.

[0131] The present disclosure integrates the valve core 12 with the rotor 151, which reduces the overall number of parts and improves the response speed of the servo valve.

[0132] Furthermore, the rotor 151 can be configured as a regular polygonal structure with an even number of sides, or the rotor 151 can be configured as a circular structure. When this type of structure is fixed, the opposite sides can be subjected to symmetrical forces, making the fixation more stable and thus improving the response speed.

[0133] In the embodiments of this disclosure, the connection end of the valve core 12 and the rotor 151 and / or the rotor 151 is hollow. The end face of the opposite end of the rotor 151 is provided with a connection groove 1511. The inner wall of the connection groove 1511 is provided with a plurality of processing grooves 1512, which are used to further connect and fix the valve core 12 and the rotor 151 to other structures through the processing grooves 1512 after the valve core 12 and the rotor 151 are connected.

[0134] Optionally, other components, such as small components like magnets, can also be installed in the connecting slot 1511 to improve space utilization.

[0135] Specifically, the component is arranged symmetrically in the connecting groove 1511 to ensure that the axial torque of the rotor 151 is balanced during operation.

[0136] It should be noted that the connection end between the valve core 12 and the rotor 151 is hollow, and / or the rotor 151 is hollow, which helps to reduce the overall weight of the valve core 12 and the rotor 151 and thus reduce the moment of inertia, so as to obtain a higher response speed.

[0137] The rotor 151 has a connecting groove 1511 and a machining groove 1512 on its opposite end face. The machining groove 1512 can be further filled with adhesive or added with fixing structure after the rotor 151 is fixed, so that the connection is more stable and the response speed is further improved.

[0138] Specifically, when other small-volume components are installed in the connecting groove 1511, the components are fixed by filling the machining groove 1512 with adhesive or adding a fixing structure to prevent loosening and imbalance during operation.

[0139] Referring to Figures 1-5, 7, and 10-12, in the embodiments of this disclosure, at least one set of guide grooves 121 are provided around the valve core 12, and at least one of the guide grooves 121 spans two adjacent through grooves 131 in the same set to guide the liquid passage.

[0140] It should be noted that, since the oil supply port 1111 and / or oil return port 1112 of the same layer liquid flow channel 111 are opened on the valve sleeve 13 in the same group of through grooves 131, the number of through grooves 131 in the same group is greater than or equal to the sum of the number of oil supply ports 1111 and the number of oil return ports 1112 of the liquid flow channel 111 at the corresponding level of the group of through grooves 131.

[0141] Referring to Figure 10, specifically, the liquid flow channel 111 also includes a control flow channel 1118. The control flow channel 1118 has multiple control ports 1113 for controlling the flow direction of the oil. The control ports 1113 span two adjacent sets of through slots 131 to guide the liquid passage.

[0142] More specifically, the control port 1113 connects to two different sets of through channels 131, through which oil entering from one set of oil supply ports 1111 is guided to the other set of oil return ports 1112, and returns to the oil circulation through the liquid flow channel 111.

[0143] Referring to Figure 10, in the embodiments of this disclosure, the oil supply ports 1111 of the same level liquid flow channel 111 are arranged radially symmetrically around the valve sleeve 13, the oil return ports 1112 of the same level liquid flow channel 111 are arranged radially symmetrically around the valve sleeve 13, and the control ports 1113 of the same level liquid flow channel 111 are arranged radially symmetrically around the valve sleeve 13, forming a central symmetry overall.

[0144] In the embodiments of this disclosure, the dimensions of the guide grooves 121 in the same group are consistent and they are radially and evenly distributed on the valve core 12. There is an angular offset between two adjacent groups of guide grooves 121, and the offset angle range is less than or equal to 90°.

[0145] It should be noted that after the oil flows out from the outlet end of the liquid flow channel 111, it enters the through groove 131 of the valve sleeve 13, and flows to the guide groove 121 corresponding to the valve core 12 after being squeezed, and then flows out of the valve sleeve 13 through the guide groove 121 connecting the two adjacent through grooves 131.

[0146] Optionally, in one embodiment of this disclosure, the number of adjacent groups of guide channels 121 is the same, and the size and shape of adjacent groups of guide channels 121 are the same.

[0147] Alternatively, in another embodiment of this disclosure, at least one of the number, size, and shape of two adjacent sets of guide channels 121 is different.

[0148] It should be noted that the number, size, and shape of the guide grooves 121 will affect the final size of the valve core 12, thereby indirectly affecting the overall structural size of the servo valve.

[0149] Understandably, by limiting the number, size, shape, and angular offset of the guide channels 121, the arrangement of the guide channels 121 can be controlled, making the arrangement of the guide channels 121 more compact, thereby reducing the volume of the valve core 12.

[0150] In the embodiments of this disclosure, the opening of the guide groove 121 is a plane, and the plane is concave relative to the outer surface of the valve core 12 at that location.

[0151] It should be noted that the groove opening plane of the guide groove 121 is concave relative to the outer surface of the valve core 12, which can further reduce the contact area between the valve core 12 and the valve sleeve 13. In addition, the groove opening of the guide groove 121 is set in a planar form, which is convenient for processing, can improve processing efficiency, and at the same time control the mating dimensions between the guide groove 121 and the valve sleeve 13.

[0152] The technical solution disclosed herein uses a layered liquid flow channel 111, which acts on the valve core 12 through the through groove 131 on the valve sleeve 13. This ensures that the force of the oil acting on the valve core 12 is evenly distributed, rather than acting uniformly in a very small area of ​​the valve core 12. Furthermore, the oil supply ports 1111 of the same layer of liquid flow channel 111 are symmetrically arranged on the valve sleeve 13, so that the forces acting on the valve sleeve 13 and even the same area of ​​the valve core 12 in different directions cancel each other out, reducing the axial torque on the valve core 12. Specifically, the gradually decreasing spacing of the inner walls of the through groove 131 on the valve sleeve 13 from the side closer to the valve body 11 to the side closer to the valve core 12 reduces or even completely eliminates the oil vortex on the outer wall of the valve sleeve 13 when the oil flows through the through groove 131, thereby reducing the energy loss of the valve body 11. At the same time, the oil pressure flowing through the valve core 12 is consistent, making the force on the valve core 12 more balanced, further canceling the axial torque on the valve core 12 and promoting the response speed of the servo valve.

[0153] Specifically, the guide groove 121 connects the two adjacent levels of the through groove 131 to form an oil circulation loop. When the oil enters through the through groove 131 on the valve sleeve 13, it acts on the valve core 12 and is discharged from the valve core 12 through the guide groove 121 on the valve core 12 from the adjacent level through groove 131. When oil leakage occurs in the valve body 11, the leaked oil is stored in the pressure equalization tank 132 to reduce the possibility of external leakage.

[0154] Define two interconnected liquid flow channels 111 as the first and second layers from bottom to top. The first layer is the oil inlet channel, and the second layer is the oil outlet channel.

[0155] Referring to Figures 9 and 10, in one embodiment, an oil supply port 1111, a control port 1113, and an oil return port 1112 are provided on the same layer of liquid flow channel 111. The three are arranged at intervals, and the oil supply port 1111, oil return port 1112, and control port 1113 of all layers are independent of each other and the same type of oil port is interconnected.

[0156] Specifically, the first column in Figure 9 shows the state diagram of the first and second layers when the valve core 12 is in the zero position. When the relative position of the valve core 12 and the valve sleeve 13 is zero, all the oil flowing out of the oil supply circuit acts directly on the valve core 12, and the guide groove 121 is not connected to the same group of through grooves 131. At this time, there is no oil flow.

[0157] The second column of Figure 9 shows the state diagrams of the first and second layers when the valve core 12 rotates clockwise from the zero position to the maximum position; the third column of Figure 9 shows the state diagrams of the first and second layers when the valve core 12 rotates counterclockwise from the zero position to the maximum position. When the valve core 12 rotates clockwise or counterclockwise relative to the valve sleeve 13 by a certain angle, the guide groove 121 and the through groove 131 are connected to the oil supply port 1111 and the control port 1113 of the same level liquid flow channel 111, forming an oil circuit. The control port 1113 leads the oil out of the valve sleeve 13 and into the liquid flow channels 111 of other levels, while the oil of other levels is introduced into the valve core 12 of this level through the control port 1113, and guided to the return oil port 1112 through the guide groove 121 to enter the oil circulation.

[0158] It can be seen that the larger the rotation angle of the valve core 12 relative to the valve sleeve 13, the greater the liquid flow rate. When the rotation angle of the valve core 12 relative to the valve sleeve 13 is the largest, the liquid flow rate reaches its maximum value.

[0159] Referring to Figures 11 and 12, in one embodiment, only an oil supply port 1111 and a control port 1113 are provided on the same layer of liquid flow channel 111, or only an oil return port 1112 and a control port 1113 are provided on the same layer of liquid flow channel 111. The oil supply port 1111 and the control port 1113 are arranged alternately, and the oil return port 1112 and the control port 1113 are arranged alternately. The two layers of liquid flow channels 111 with only an oil supply port 1111 and a control port 1113 and only an oil return port 1112 and a control port 1113 are connected through the control port 1113.

[0160] In one embodiment, the control flow channel 1118 includes a first control flow channel 1119 and a second control flow channel 1120 that are independent of each other; the first control flow channel 1119 is provided with at least one set of first control ports 1114, each set of first control ports 1114 being symmetrically distributed about the axial center of the valve core 12, and the valve sleeve 13 is provided with a through groove 131 corresponding to the first control ports 1114; the second control flow channel 1120 is provided with at least one set of second control ports 1115, each set of second control ports 1115 being symmetrically distributed about the axial center of the valve core 12, and the valve sleeve 13 is provided with a through groove 131 corresponding to the second control ports 1115.

[0161] Each group of first control ports 1114 and each group of second control ports 1115 are arranged in a centrally symmetrical manner, so that they can cancel each other out.

[0162] Referring to Figures 10 and 11, in one embodiment, the oil supply port 1111, the first control port 1114, and the second control port 1115 are arranged on the same layer and spaced apart sequentially. Rotation of the valve core 12 allows the oil supply port 1111 to connect with one of the first control port 1114 and the second control port 1115. Similarly, the oil return port 1112, the first control port 1114, and the second control port 1115 are arranged on the same layer and spaced apart sequentially. Rotation of the valve core 12 allows the oil return port 1112 to connect with the other of the first control port 1114 and the second control port 1115.

[0163] Specifically, when the relative position of the valve core 12 and the valve sleeve 13 is zero, all the oil flowing out of the oil supply circuit acts directly on the valve core 12, and the guide groove 121 is not connected to the same group of through grooves 131, so there is no oil flow at this time.

[0164] Rotating the valve core 12 causes the guide groove 121 and the through groove 131 to connect multiple levels of oil supply ports 1111, control ports 1113 and return ports 1112, forming an oil circulation between at least two levels. At this time, the oil supply port 1111 and the return port 1112 are located in two different levels, which can realize one level of oil supply and one level of oil return to ensure smooth flow of the oil circuit and sufficient liquid flow.

[0165] When the valve core 12 rotates clockwise relative to the valve sleeve 13 by a certain angle, the valve core 12 connects the oil supply port 1111 of the first layer with the second control port 1115, and at the same time connects the oil return port 1112 of the second layer with the first control port 1114, thereby realizing that the oil supply port 1111 supplies oil to the second control port 115, and the return oil returns to the return port 1112 through the first control port 1114, thus realizing the reversal.

[0166] When the valve core 12 rotates counterclockwise by a certain angle relative to the valve sleeve 13, the valve core 12 connects the oil supply port 1111 in the first layer to the first control port 1114, and at the same time connects the second control port 1115 in the second layer to the oil return port 1112, thereby realizing that the oil supply port 1111 supplies oil to the first control port 111, and the oil returns to the oil return port 1112 through the second control port 1115, thus realizing the reversal.

[0167] Secondly, the rotation of valve core 12 can also change the flow area, thereby achieving flow regulation. The larger the rotation angle of valve core 12 relative to valve sleeve 13, the greater the liquid flow rate. When the rotation angle of valve core 12 relative to valve sleeve 13 is at its maximum, the liquid flow rate reaches its maximum value.

[0168] Referring to Figures 13, 14, and 15, the oil supply port 1111, the oil return port 1112, and the first control port 1114 are arranged on the same layer and spaced apart. Rotation of the valve core 12 allows the first control port 1114 to connect with one of the oil supply port 1111 or the oil return port 1112. Similarly, the oil supply port 1111, the oil return port 1112, and the second control port 1115 are arranged on the same layer and spaced apart. Rotation of the valve core 12 allows the second control port 1115 to connect with one of the oil supply port 1111 or the oil return port 1112.

[0169] Specifically, when the relative position of the valve core 12 and the valve sleeve 13 is zero, all the oil flowing out of the oil supply circuit acts directly on the valve core 12, and the guide groove 121 is not connected to the same group of through grooves 131, so there is no oil flow at this time.

[0170] Rotate the valve core 12 so that the guide groove 121 and the through groove 131 are connected to the oil supply port 1111, control port 1113 and return port 1112 of multiple levels. The oil forms an oil circulation between at least two levels. At this time, both levels are provided with oil supply port 1111 and return port 1112. One level supplies oil and the other level returns oil to ensure smooth flow of the oil circuit and sufficient liquid flow.

[0171] When the valve core 12 rotates clockwise relative to the valve sleeve 13 by a certain angle, the guide groove 121 of the valve core 12 enables the first layer oil return port 1112 to be connected to the first control port 1114, while simultaneously enabling the second layer oil supply port 1111 to be connected to the second control port 1115. This achieves simultaneous oil supply from the second layer and oil return from the first layer.

[0172] When the valve core 12 rotates counterclockwise relative to the valve sleeve 13 by a certain angle, the guide groove 121 of the valve core 12 enables the oil supply port 1111 of the first layer to be connected to the first control port 1114, while simultaneously enabling the oil return port 1112 of the second layer to be connected to the second control port 1115. This achieves simultaneous oil supply from the first layer and oil return from the second layer.

[0173] Furthermore, the valve body 11 is provided with an oil supply connection port communicating with the oil supply channel 1116, an oil return connection port communicating with the oil return channel 1117, a first working connection port communicating with the first control channel 1119, and a second working connection port communicating with the second control channel 1120. The oil supply connection port, the oil return connection port, the first working connection port, and the second working connection port can be connected to different equipment as needed, such as oil pumps, oil tanks, and the large and small chambers of oil cylinders.

[0174] It should be noted that when the overall structure of the servo valve is small, it usually only needs to circulate across two adjacent layers, and there will be no situation where it crosses multiple liquid flow channels 111. However, if there are design requirements that require increasing the volume of the servo valve, or if it is necessary to cross multiple liquid flow channels 111 at the same time, the connection of liquids in multiple liquid flow channels 111 can be achieved by changing the number of connected liquid flow channels 111. Correspondingly, the size of the liquid flow channel 111 will also be adjusted to ensure sufficient flow capacity. There is no absolute limitation here.

[0175] Secondly, in some embodiments of this application, the spacing between the inner walls of the through groove 131 can also be the same, for example, rectangular holes, cylindrical holes, polygonal holes, etc. That is, the flow area of ​​the through groove 131 does not change. The liquid flow channel 111 is basically the same as in the previous embodiment, and can be referred to the above embodiments; this application will not repeat it further.

[0176] It should be understood that the terms "one embodiment" or "one example" used throughout the specification mean that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this disclosure. Therefore, "in one embodiment" or "in one example" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to this disclosure.

[0177] In the various embodiments of this disclosure, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this disclosure.

[0178] The above description is merely an exemplary embodiment of this disclosure and does not limit the patent scope of this disclosure. Any equivalent structural transformations made using the contents of this specification and drawings under the technical concept of this disclosure, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this disclosure. Industrial applicability

[0179] In summary, the high-response servo valve provided in this disclosure utilizes a through-slot on the valve sleeve, with the spacing between the inner walls of the through-slot gradually decreasing from the side closer to the valve body to the side closer to the valve core. This ensures that the force exerted by the oil flowing through the through-slot on the valve core is relatively evenly distributed, preventing it from concentrating in a very small area of ​​the valve core. Furthermore, the symmetrical arrangement of the oil supply and return ports at the same level allows forces acting on the same area of ​​the valve core in different directions to cancel each other out, reducing valve core vibration and improving accuracy.

Claims

1. A high-response servo valve, characterized in that: The high-response servo valve includes a valve body, a valve core disposed within the valve body, and a valve sleeve surrounding the valve core and disposed within the valve body. The valve body has a liquid flow channel for oil circulation. The liquid flow channel is arranged in layers, and the liquid flow channel has a symmetrically arranged oil supply port and / or oil return port at one end near the valve sleeve. The valve sleeve has at least two sets of through grooves that connect the inner and outer walls. The through grooves guide the oil in the oil supply port to the inside of the valve sleeve and guide the oil in the valve sleeve to the oil return port. The distance between the inner walls of the through grooves gradually decreases from the side near the valve body to the side near the valve core.

2. The high-response servo valve as described in claim 1, characterized in that: The liquid flow channel includes an oil supply channel, and the oil supply channel is provided with multiple sets of oil supply ports around the valve core. Each set has two oil supply ports, and the two oil supply ports of each set are symmetrically distributed about the axial center of the valve core. The through groove connecting to the oil supply port corresponds to the position of the oil supply port.

3. The high-response servo valve according to claim 2, characterized in that: The oil supply channel includes a main oil supply channel and multiple branch oil supply channels connected to the main oil supply channel. Each oil supply port is correspondingly provided with a branch oil supply channel. The main oil supply channel is configured to connect to an oil supply device. Multiple sets of oil supply ports are arranged in multiple layers along the height direction of the valve body, with two oil supply ports in any group arranged in the same layer, and multiple sets of oil supply ports located in the same layer arranged symmetrically about the axis of the valve core.

4. The high-response servo valve as described in claim 1, characterized in that: The liquid flow channel also includes a return oil flow channel, and the return oil flow channel is provided with multiple sets of return oil ports around the valve core. Each set has two return oil ports, and the two return oil ports of each set are symmetrically distributed about the axial center of the valve core. The through groove connecting to the oil return port corresponds to the position of the oil return port.

5. The high-response servo valve as described in claim 4, characterized in that: The return oil flow channel includes a main return oil flow channel and multiple branch return oil flow channels connected to the main return oil flow channel. The branch return oil flow channels are provided one-to-one with the return oil ports. The main return oil flow channel is configured to connect to the return oil equipment. Multiple sets of oil return ports are arranged in multiple layers along the height direction of the valve body, with two oil supply ports in each set arranged in the same layer, and multiple sets of oil return ports located in the same layer arranged symmetrically about the axis of the valve core.

6. The high-response servo valve as described in claim 1, characterized in that: The liquid flow channel includes an oil supply channel and an oil return channel; The oil supply channel is provided with multiple sets of oil supply ports around the valve core, each set having two oil supply ports, and the two oil supply ports of each set are symmetrically distributed about the axial center of the valve core. The return oil channel is provided with multiple sets of return oil ports around the valve core, each set having two return oil ports, and the two return oil ports of each set are symmetrically distributed about the axial center of the valve core. The oil supply port and the oil return port, located on the same layer, are symmetrically arranged about two diameters perpendicular to the valve core.

7. The high-response servo valve as described in claim 1, characterized in that: The through groove is formed radially along the valve sleeve; The side walls of the through groove in the circumferential direction of the valve sleeve are the first side wall and the second side wall, respectively. The distance between the first sidewall and the second sidewall gradually decreases in the radial direction of the valve sleeve from the outside to the inside. Each group has two through slots, and the two through slots in each group are symmetrically distributed about the axial center of the valve core.

8. The high-response servo valve as described in claim 1, characterized in that: The through grooves are evenly arranged around the valve sleeve, and the plane of each group of through grooves is perpendicular to the axial extension line of the valve sleeve. The distance between two adjacent groups of through grooves is 0.5mm-50mm. And / or, The through grooves in the same group have the same size, and any two adjacent groups of through grooves are offset relative to each other in the circumferential direction of the valve sleeve, and the offset angle is less than or equal to 90°.

9. The high-response servo valve as described in claim 1, characterized in that: The number of adjacent sets of through slots is the same, and their size and shape are also the same; or, the number, size and shape of adjacent sets of through slots are different in at least one of the following:

10. The high-response servo valve as described in claim 1, characterized in that: The included angle formed by the through groove relative to the inner wall extension surfaces on both sides is less than 60°. And / or, The gap between the valve core and the valve sleeve is 0um-25um.

11. The high-response servo valve as described in claim 1, characterized in that: The valve sleeve slides with the valve core, and the inner and outer surfaces of the valve sleeve are provided with pressure equalization grooves between two adjacent sets of through grooves, and / or the inner and outer surfaces of the valve sleeve are provided with pressure equalization grooves between any two adjacent through grooves.

12. The high-response servo valve as described in claim 1, characterized in that: The oil supply port and / or oil return port of the liquid flow channel in the same layer correspond to the same group of through slots opened on the valve sleeve, and the number of through slots in the same group is greater than or equal to the sum of the number of oil supply ports and the number of oil return ports of the liquid flow channel in the corresponding layer.

13. The high-response servo valve as described in claim 12, characterized in that: The liquid flow channel also includes a control flow channel, which has multiple control ports for controlling the flow direction of the oil. The oil supply ports of the same level liquid flow channel are radially symmetrically arranged around the valve sleeve, the oil return ports of the same level liquid flow channel are radially symmetrically arranged around the valve sleeve, and the control ports of the same level liquid flow channel are radially symmetrically arranged around the valve sleeve.

14. The high-response servo valve as described in claim 12, characterized in that: Oil supply ports, control ports, and return ports are provided on the same liquid flow channel, with all three arranged at intervals. The oil supply ports, return ports, and control ports at all levels are independent of each other, but ports of the same type are interconnected; or, Only an oil supply port and a control port are provided on the same layer of liquid flow channel, and the oil supply port and the control port are arranged at intervals; or, Only return ports and control ports are provided on the same layer of liquid flow channel, and the return ports and control ports are set at intervals; or, Only an oil supply port and a control port are provided on the same layer of liquid flow channel, and the oil supply port and the control port are spaced apart; only an oil return port and a control port are provided on the same layer of liquid flow channel, and the oil return port and the control port are spaced apart; wherein: the two layers of liquid flow channels with only an oil supply port and a control port and the two layers with only an oil return port and a control port are connected through the control port.

15. The high-response servo valve as described in claim 13, characterized in that: The control flow channel includes a first control flow channel and a second control flow channel that are independent of each other; the first control flow channel is provided with at least one set of first control ports, each set of first control ports being symmetrically distributed about the axis center of the valve core, and the valve sleeve is provided with the through groove corresponding to the first control port; the second control flow channel is provided with at least one set of second control ports, each set of second control ports being symmetrically distributed about the axis center of the valve core, and the valve sleeve is provided with the through groove corresponding to the second control port; The oil supply port, the first control port, and the second control port are arranged on the same layer and spaced apart sequentially. Rotation of the valve core allows the oil supply port to selectively connect with either the first control port or the second control port. Alternatively, the oil return port, the first control port, and the second control port are arranged on the same layer and spaced apart sequentially. Rotation of the valve core allows the oil return port to selectively connect with either the first control port or the second control port. Alternatively, the oil supply port, the oil return port, and the first control port are arranged on the same layer and spaced apart sequentially. Rotation of the valve core allows the first control port to connect with either the oil supply port or the oil return port. Alternatively, the oil supply port, the oil return port, and the second control port are arranged on the same layer and spaced apart sequentially. Rotation of the valve core allows the second control port to connect with either the oil supply port or the oil return port.

16. The high-response servo valve as described in claim 1, characterized in that: At least one set of guide grooves are arranged around the valve core. The guide grooves in the same set are of the same size and are radially evenly distributed on the valve core. There is an angular offset between adjacent sets of guide grooves, and the value of the offset angle is less than or equal to 90°.

17. The high-response servo valve as described in claim 16, characterized in that: The number of adjacent groups of guide channels is the same, and the size and shape of adjacent groups of guide channels are the same, or, at least one of the number, size and shape of adjacent groups of guide channels is different; And / or, The opening of the guide groove is a plane, and the plane is concave relative to the outer surface of the valve core at that location.

18. The high-response servo valve as described in claim 1, characterized in that: The valve sleeve and the valve body are respectively provided with a positioning component for cooperation. The positioning component is used to restrict the valve sleeve from rotating relative to the valve body so that a set of through grooves corresponds to the position of the oil supply port and a set of through grooves corresponds to the position of the oil return port. And / or, The valve body is provided with a limiting structure that restricts the rotation angle of the valve core.

19. The high-response servo valve as described in claim 1, characterized in that: The high-response servo valve also includes a servo motor that drives the valve core to move. The servo motor includes an internal rotor, which is a regular polygonal structure or a circular structure. Wherein, when the rotor is a regular polygonal structure, the number of sides of the regular polygon satisfies 2N+2, where N is a positive integer.

20. A high-response servo valve, characterized in that: The high-response servo valve includes a valve body, a valve core disposed within the valve body, and a valve sleeve surrounding the valve core and disposed within the valve body. The valve body has a liquid flow channel for oil circulation. The liquid flow channel is arranged in layers, and the liquid flow channel has a symmetrically arranged oil supply port and / or oil return port at one end near the valve sleeve. The valve sleeve has at least two sets of through grooves that connect the inner and outer walls. The through grooves guide the oil in the oil supply port to the inside of the valve sleeve and guide the oil in the valve sleeve to the oil return port.

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